ASTM_D_7319_-_13.pdf

Designation:D731913Standard Test Method forDetermination of Existent and Potential Sulfate andInorganic Chloride in Fuel Ethanol and Butanol by DirectInjection Suppressed Ion Chromatography1This standard is issued under the fixed designation D7319;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers a direct injection ion chromato-graphic procedure for determining existent and potential inor-ganic sulfate and total inorganic chloride content in hydrousand anhydrous denatured ethanol and butanol to be used inmotor fuel applications.It is intended for the analysis ofethanol and butanol samples containing between 1.0 to 20mg/kg of existent or potential inorganic sulfate and 1.0 to 50mg/kg of inorganic chloride.NOTE1Tertiary butanol is not included in this test method.1-butanol,2-butanol,and isobutanol are included in the testing and research reportfor this test method.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.Material SafetyData Sheets are available for reagents and materials.Reviewthem for hazards prior to usage.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD5827 Test Method for Analysis of Engine Coolant forChloride and Other Anions by Ion ChromatographyD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6792 Practice for Quality System in Petroleum Productsand Lubricants Testing LaboratoriesD7318 Test Method for Existent Inorganic Sulfate in Ethanolby Potentiometric TitrationD7328 Test Method for Determination of Existent and Po-tential Inorganic Sulfate and Total Inorganic Chloride inFuel Ethanol by Ion Chromatography Using AqueousSample Injection2.2 European Norm Standards:3EN 15492 Ethanol as a blending component for petrol-Determination of inorganic chloride and sulfate content-Ion chromatographic method3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 existent inorganic sulfate,ninorganic sulfate speciesactually present in the sample at the time of analysis with nooxidation treatment.3.1.2 inorganic chloride,nchloride present as hydrochlo-ric acid,ionic salts of this acid,or mixtures of these.3.1.3 inorganic sulfate,nsulfate(SO4-2)species present assulfuric acid,ionic salts of this acid,or mixtures of these.3.1.4 potential sulfate,ninorganic sulfate species presentafter the sample has been reacted with an oxidizing agent.4.Summary of Test Method4.1 For existent inorganic sulfate and total chloride,a smallvolume of an ethanol or butanol sample is directly injected intoa suitably configured ion chromatograph in accordance withmanufacturers recommendations for this test method.For1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.03 on Elemental Analysis.Current edition approved May 1,2013.Published August 2013.Originallyapproved in 2007.Last previous edition approved in 2012 as D7319 12.DOI:10.1520/D7319-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 potential sulfate,0.5 mLof 30%hydrogen peroxide solution isadded to 9.5 mL of the ethanol or butanol sample,and theninjected into the ion chromatograph.Ions are separated basedon their affinity for exchange sites of the resin with respect tothe resins affinity for the eluent.The suppressor increases thesensitivity of the test method by both increasing the conduc-tivity of the analytes and decreasing the conductivity of theeluent.It also converts the eluent and analytes to the corre-sponding hydrogen forms of anions.Anions are quantified byintegration of their response